I bought mine with a NATO stock because I have a big ol pile of AR mags but looking back I think I may have liked the AUG stock better for the bolt release. I could have bought 10 AUG mags and been good to go most likely, but oh well hindsight and all that. I have ran reload drills on my timer and gotten to with 1-1.5 or so seconds of an AR reload running the charging handle. My current reload cycle basically uses my left hand for everything. So strip mag from stock, retrieve and insert new mag, run charging handle. I've tried to do the HK style of reload by locking the charging handle back on the way back to drop the mag but the mechanics involved in locking it to the rear at speed under the timer produced too many missed attempts so I went back the simpler run the charging handle technique.